CN103411821B - The experiment research that a kind of wire rope lost efficacy - Google Patents
The experiment research that a kind of wire rope lost efficacy Download PDFInfo
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- CN103411821B CN103411821B CN201310367893.9A CN201310367893A CN103411821B CN 103411821 B CN103411821 B CN 103411821B CN 201310367893 A CN201310367893 A CN 201310367893A CN 103411821 B CN103411821 B CN 103411821B
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Abstract
The experiment research that a kind of wire rope lost efficacy is that ring establishes wire rope magnetic NDT method to pop one's head in around steel wire test, and non magnetic wedge is fixed in wire rope magnetic NDT method probe; The inwall of corresponding wire rope magnetic NDT method probe is provided with transversal force device in order to apply transverse force; After to be provided with the tensilometer of stretching, bending and torsion stress in the two ends of steel wire test; Secondly the axis applying to steel wire test stretches, the alternation tension of bending and torsion; Imposed load, at 20-40%, is made mechanical periodicity with certain frequency between broken load, is applied with transverse force simultaneously by transversal force device to steel wire, and whole process is by changes of magnetic field in magnetic NDT method probe measurement steel wire, until steel wire test fracture.This method adopts monofilament test method(s), and the damage process of continuous coverage steel wire, decrease interference, improve the reliability of experiment.
Description
Technical field
The present invention relates to a kind of wire rope lost efficacy research method, particularly a kind of based on simulation Practical Project system and condition of work under for study wire rope lost efficacy experimental technique.
Technical background
Wire rope, wirerope are for lifting, the important tool of traction and maintenance tensioning.Wire rope and wirerope are all crucial bearing carrier in most cases, and it bears stretchings, bending, torsion, contact stress, and the fatigue that causes of these stress and wearing and tearing.The improper overload, mechanical damage etc. caused of burn into manual operation caused due to environment is also the major reason that lost efficacy of wire rope and wirerope and mechanism.Particularly in colliery, work under bad environment, and wire rope and wirerope are connected the tie that ground and underground population, equipment and material are elevated especially.Since wire rope in 1834 since Germany comes out and uses, the status monitoring of wire rope, the prediction in residual intensity and life-span is wire rope research always, manufactures, uses the problem very paid close attention to.The wear and rupture of wire rope causes the massive losses of a large amount of lives and properties.
In the prior art, also fail to obtain for wire rope damage and failure, serviceable life influence factor research method and the bibliographical information of equipment, and be that wire rope by occurring to rupture carries out analyzing the reason inferred and cause inefficacy mostly, the accurate result drawn not by the factors such as the various stretchings of experimental simulation wire rope when stressed, bending, torsion, compression and situation.In research method, great majority are with whole wire rope for sample, carry out magnetic detecting research containing a lot of influence factor, thus reduce the reliability that research wire rope lost efficacy under the static state do not stressed to wire rope.
In the prior art, publication number is that CN102323144A discloses one " wire rope stretching clamp and Horizontal wire rope cupping machine thereof ", this testing machine only can carry out breaking tensile to wire rope, working conditions such as reversing, bending can not be applied to wire rope, perfect not to the failure mechanism of research wire rope.Also have publication number to be that CN2676181 discloses one " fatigue device tested by wire rope and pulley ", this device is the wire rope fatigue behaviour device studied under wire rope and pulley combination, can not simulate separately the failure mechanism of wire rope.
The prior art of above-mentioned open report, be only device wire rope being carried out to fatigue behaviour tension test, method is also the method adopting magnetic detecting, therefore, to the damage and failure of wire rope, serviceable life influence factor discussion, failed substantial theory and technology and broken through.
Summary of the invention
On the basis of existing technology, simulation wire rope lost efficacy and broke the experimental study of load, and provided the experiment research that a kind of wire rope lost efficacy in the present invention.
To achieve these goals, the experiment research that a kind of wire rope provided by the present invention lost efficacy, described in it, method is as follows:
First around steel wire test, ring establishes wire rope magnetic NDT method to pop one's head in, and non magnetic wedge is fixedly installed in the inwall centre position of wire rope magnetic NDT method probe, and its termination is circular and be close to steel wire test; The inwall centre position that the wire rope magnetic NDT method corresponding with non magnetic wedge is popped one's head in is provided with transversal force device in order to apply transverse force; Then be provided with to steel wire test in order to apply the tensilometer of stretching, bending and torsion stress in the two ends of steel wire test;
Secondly the alternation tension of stretching, bending and torsion is applied in the axis of steel wire test; Imposed load is at 20-40% Breaking load, and broken load makes mechanical periodicity with certain frequency, is applied with transverse force by transversal force device to steel wire simultaneously, and whole process is by the change in magnetic field in magnetic NDT method probe measurement steel wire, until steel wire test fracture.
Further technical scheme is as follows.
Described magnetic NDT method probe is telescoping structure, is 10 ﹕ 1 with the diameter ratio of steel wire test.
Described non magnetic wedge is made up of pottery or plastic insulation material.
Described transversal force device is supported with inner sleeve by guide frame to be arranged with outer sleeve, and outer sleeve inner face is provided with a projection and exerts a force to steel wire test, is provided with spring in the inner sleeve corresponding to outer sleeve.
On steel wire test, the sodium-chloride water solution that corrosive medium is 5% is dripped in the force process of described method.
Carry out resistance heated to steel wire test in the force process of described method, heating-up temperature is 0-40 DEG C.
The variation frequency of described imposed load is ± 5%.
The sectional shrinkage of described steel wire is 0-10%.
Implement the experiment research that above-mentioned the provided a kind of wire rope of the present invention lost efficacy, compared with prior art, its advantage and good effect are: the experiment research that the present invention proposes have employed monofilament test method(s), and the wire rope simulation load process of complete set is devised around the process of experimental of the method, can apply to stretch to steel wire test, reverse, the stress of bending, transverse shear stress, also can the effect of corrosion simulation and temperature rise, decrease interference, improve the reliability of experiment; Magnetic NDT method apparatus installation, thus can the damage process of continuous coverage wire rope in the outside of wire rope; Except steel wire, other parts being arranged on nondestructive detecting instrument inside all use nonferromugnetic material manufacture, guarantee that whole field signal is from steel wire test; The method can also to after steel wire test electrical isolation, resistance heated is carried out while stressed, the phenomenon that in the actual use of simulation, temperature raises, really achieving reliability and the authenticity of wire rope load force simulation experimental study, providing theoretical foundation for determining the various wire rope load stressed time limit.
Accompanying drawing explanation
Fig. 1 is experimental technique schematic diagram.
Fig. 2 is wire rope magnetic NDT method figure.
Fig. 3 is transversal force device experimental configuration schematic diagram.
The monitoring of Fig. 4 method of magnetic damage of steel cable and condition adjudgement figure.
In figure: 1: steel wire test; 2: non magnetic wedge; 3: wire rope magnetic NDT method is popped one's head in; 4: transversal force device; 5: guide frame.
Embodiment
Below specific embodiment of the invention is further illustrated.
As in accompanying drawing 1: be 1. steel wire test, as the high-carbon steel drawn steel wire of 1-5mm, plating zinc on surface or light face, steel wire test applies stretching, bending, distorting stress.2. be the wedge made as austenitic stainless steel of nonmagnetic substance, circle is processed at its top, similar with studied wirerope diameter, the other steel wire that simulation contacts with 1. steel wire test.2. wedge shape jacking block selects nonmagnetic substance to ensure that magnetic signal all from steel wire 1..Steel wire stress simulation device shown on the left of Fig. 1 by be arranged on a wire rope magnetic NDT method equipment probe 3. in.3. the probe of checkout equipment is openable cylindrical shape, and its diameter is determined by the nondestructive testing instrument selected.
In wire rope especially multilayer strand non-rotating cable and the mutual twisting of multi-layer wire single cord in, steel wire subjects except stretching, upper and lower two-layer steel wire except bending and torsion is to its transverse pressure, for simulating this stressing conditions, the second experimental provision of the present invention add transverse force device feature 4. with guide frame 5., all install and inside 3. with stress simulation device, relative position relation is as accompanying drawing 2.By spring or other physical construction, 1. transverse compressive stress is applied to steel wire.
The concrete constituent relation of device is: wire rope magnetic NDT method instrument is for IntroMH20-40, the probe 3. diameter 40mm of wire rope magnetic NDT method, the wedge shape jacking block that nonmagnetic substance makes 2. length is 15-19mm, wedge is fixedly installed in the roughly centre position of detector inside, circle is processed at top, simulates the steel wire adjacent with sample; Transverse force charger is fixedly installed in the position of the same height of opposite side of opposite wedge jacking block, and be made up of spring and mechanical part, apply transverse force for simulating other steel wires to sample, its length is about 20mm(spring-compressed).
Experimental study of the present invention is embodied as:
When testing, first with tensilometer, first 1. axis and longitudinal alternation tension are applied to steel wire, 1. the load applied to steel wire test is broken between load at 20-40% and is made mechanical periodicity with certain frequency, 4. constant transverse compressive stress is applied to steel wire by transverse force device simultaneously, the change in magnetic field in the probe that magnetic NDT method instrument is housed 3. measuring steel wire of whole process, until steel wire test fracture.In this device, can also with dropper at steel wire and parts 2., 4. between add corrosive medium as 5% sodium-chloride water solution, the corrosive attack that simulation wire rope suffers.
1. 2. and 4. the parts contacted with steel wire in accompanying drawing 2 can also be selected to make of electrically insulating material (as pottery and polymer composite), like this while carrying out magnetic signal measurement, resistance or impedance measurement can be carried out, to obtain the more information of steel wire state.Cause cross section to reduce after such as crackle is formed, the resistance value of steel wire increases.If 2. and 4. parts use austenite stainless steel making, also in its surperficial coated ceramic coating, electrical isolation object can be reached.
The present invention is the failure procedure being studied wire rope by the minimizing of test metal cross-sectional area and the tension of loading, the relation of transverse stress, be specially tensilometer to the alternation tension (or distorting stress) of steel wire test imposed load at 20-40%, load variations frequency is ± 5%, studies the relation drawing the sectional shrinkage of steel wire (0-10%) and loading parameters in specialized range.
The present invention can also reduce according to along with metal cross-sectional area, and resistance increases this principle, imposes electric signal to steel wire, studies the change of current signal under different stress condition, draws the relation of section of steel wire change and loading force.
Namely under the prerequisite ensureing typical sample, simplify sample, increased the representativeness of experiment condition simultaneously by unique design, research, reduction, analyze; And then draw the failure mechanism of wire rope.
Claims (8)
1. an experiment research for wire rope inefficacy, described in it, experiment research is as follows:
First around steel wire test (1), be equipped with wire rope magnetic NDT method probe (3), non magnetic wedge (2) is fixedly installed in the inwall centre position of wire rope magnetic NDT method probe (3), and its termination is circular and be close to steel wire test (1); The pop one's head in inwall centre position of (3) of the wire rope magnetic NDT method corresponding with non magnetic wedge (2) is provided with transversal force device (4) in order to apply transverse force; Then the tensilometer applying stretching, bending and torsion stress to steel wire test (1) is provided with in the two ends of steel wire test (1);
Secondly the alternation tension of stretching, bending and torsion is applied in the axis of steel wire test (1); Imposed load, at 20-40%, makes mechanical periodicity with certain frequency between Breaking load, is applied with transverse force steel wire by transversal force device (4) simultaneously, and whole process is popped one's head in by magnetic NDT method the change in magnetic field in (3) measuring steel wire, until steel wire test (1) fracture.
2. the experiment research of wire rope inefficacy as claimed in claim 1, described in it, magnetic NDT method probe (3) is telescoping structure, is 10 ﹕ 1 with the diameter ratio of steel wire test (1).
3. the experiment research of wire rope inefficacy as claimed in claim 1, non magnetic wedge (2) described in it is made up of pottery or plastic insulation material.
4. the experiment research of wire rope inefficacy as claimed in claim 1, transversal force device (4) described in it is supported by guide frame (5), and the inner sleeve of described transversal force device (4) is arranged with outer sleeve, outer sleeve end face is provided with a projection to steel wire test (1) force, is provided with spring in the inner sleeve corresponding to outer sleeve.
5. the experiment research that lost efficacy of wire rope as claimed in claim 1, drips corrosive medium in the force process of method described in it on steel wire test (1), described corrosive medium to be concentration be 5% sodium-chloride water solution.
6. the experiment research of wire rope inefficacy as claimed in claim 1, carry out resistance heated to steel wire test (1) in the force process of method described in it, heating-up temperature is 0-40 DEG C.
7. the experiment research of wire rope inefficacy as claimed in claim 1, the variation frequency scope of imposed load described in it is ± 5%.
8. the experiment research of wire rope inefficacy as claimed in claim 1, the sectional shrinkage of steel wire described in it is 0-10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310367893.9A CN103411821B (en) | 2013-08-22 | 2013-08-22 | The experiment research that a kind of wire rope lost efficacy |
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| CN201310367893.9A CN103411821B (en) | 2013-08-22 | 2013-08-22 | The experiment research that a kind of wire rope lost efficacy |
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| CN103411821A CN103411821A (en) | 2013-11-27 |
| CN103411821B true CN103411821B (en) | 2015-07-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104019782A (en) * | 2013-12-03 | 2014-09-03 | 中钢集团武汉安全环保研究院有限公司 | Crane steel wire rope diameter on-line measuring device and abnormal form forecasting method |
| CN107991173A (en) * | 2017-12-26 | 2018-05-04 | 贵州钢绳股份有限公司 | Steel wire shears elongation test method and its device |
| CN109900566B (en) * | 2019-04-08 | 2020-04-21 | 中国矿业大学 | Fretting fatigue test device and method for steel wire under radial impact working condition |
| CN112816324B (en) * | 2020-12-31 | 2022-03-01 | 西南大学 | Magnetic field monitoring system for reinforcing steel bar damage under coupling action of tensile load and environmental corrosion |
| CN116754364A (en) * | 2022-12-21 | 2023-09-15 | 常州凯都电器有限公司 | Drawing test detection mechanism for binding post production |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2676181Y (en) * | 2003-05-30 | 2005-02-02 | 武汉理工大学 | Fatigue test installation for wire rope and pulley |
| CN102323144A (en) * | 2011-05-31 | 2012-01-18 | 河南省煤炭科学研究院有限公司 | Steel wire rope tensile fixture and horizontal steel wire rope tensile testing machine thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664182A (en) * | 1971-02-25 | 1972-05-23 | Thomas W Butler | Tension-torsion testing machine |
| KR100540163B1 (en) * | 2003-12-16 | 2005-12-29 | 한국철도기술연구원 | Tensile force test jig for clamp |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2676181Y (en) * | 2003-05-30 | 2005-02-02 | 武汉理工大学 | Fatigue test installation for wire rope and pulley |
| CN102323144A (en) * | 2011-05-31 | 2012-01-18 | 河南省煤炭科学研究院有限公司 | Steel wire rope tensile fixture and horizontal steel wire rope tensile testing machine thereof |
Non-Patent Citations (1)
| Title |
|---|
| 舰用钢丝绳失效性检测装置研究的构想;赵茹;《船舶》;20021031(第5期);第52-54页 * |
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